Furnace door



NOV. 12, 1940. 1 HQLLMAN ETAL l 2,221,350

FURNACE DOOR Filed May 1, 1939 2 Sheets-Sheet l F113.' 1 ,fm

' F IE. 2. f

Nov. 12, 1940.

|.,J. HQLLMAN Erm.

FRNACE Doon" Filed May 1, 1959 V PIE- 5. Z. u

2 Sheets-Sheet 2 Patented Nov. 12, 1940 PATENT OFFICE Doon ,` `liewisiJ. Hollman, Munhall, and William F. Noel,

, Lincoln Place, Pa.

i Application-May 1,11939, serial No. 271,140

" soiaims (o1. 11o-173) The `present inventionfrelates `to reenforced high temperature insulate'dlinings for furnace doors, pitcovers and the like.v 4

` Anobject `ofthis invention isto provide a fur'- "5 nace door Jorpit cover "construction whichwill noti crack or spall Whensubjected yto, heating or cooling or to opening and closing.

1 vA` further object of the invention is toprovide a door or cover which is easily repaired should l it become crushed 'or bumped and a door in whichcracksand crevi-cesprevalent in doors of brick,` refractory or insulating materials are eliminated.

Other objects and advantages will become ap- 35 parent as the description proceeds and reference is had tothe accompanying drawings, in which:

Figure 1 is a front elevation `of a door con'-` structed in accordance with the present invention; y 2li Figure 2is a section on line :II-Hof Figure 1;

Figure 3 is `anenlargedsection on line III-III ofFigurel; Y

"Figure '4 is a section on line IVLIV of Figure l; and,

25 Figure 5,is an enlarged detailed fragmentary sectlonof Figure 4.

In the drawings; the reenforced high temperature lining is shown as applied to a prefabricated furnace door. The door which is illus- 30 trated as an example only, comprises a steel framework including top, bottom and side members 2 preferably angle iron members secured together in any conventional manner. Horizontal reenforcing members 3 extend between the 35 side members 2, at spaced distances from the top to the bottom of the framework and are secured, in anyiconventional manner, to the frame members 2. Vertical reenforcing members 4 are secured, in any conventional manner, to the frame 40 members 2 and the horizontal members 3. In addition, suitable diagonal reenforcing members 5 may be provided to form the completed framework. While the drawings illustrate a flat straight door or cover, it may be curved or fabri- 45 cated to any shape to suit the face of the opening of the furnaces or pits with which it is to be used.

The framework having been fabricated, there is placed within the plane thereof, `two layers of reenforcing steel mesh, the gage or weight of 50 which may vary with the weight and size of the door or cover desired. 'I'he first layer of reenforcing Wire mesh is illustrated at E, and its position within the framework is governed by the thickness of the door or cover to be made.

55 This wire mesh E is positioned substantially parallel to the framework and preferably at a 'distance from the outer face thereof equal to about one-fourth of the thickness of the door or cover desired. Y

A second reenforcing wire mesh structure 'l is 5 positioned within theframework preferably at a distance from the louter face thereof approximately equal to about one-halfV of the thickness off the door or cover.` l i Secured in any conventional manner lto the inner sides of each ofthe top, bottom and side frame angle members 2, is a member 8 to which isfsecured, in any desiredmanner, an angle member 9, onearm being provided lwith anopening to vreceive the endsjlll` of "both the Wiremesh l5 layers 6 and li This secures the layers of wire Vmesh to all `parts of the framework and, to

maintain the proper 4distance between the two wireY mesh layers, there are provided the spacing wires or rods I2. The ends ofsaid spacing rods are twisted around `or otherwisesecured to the respective wire mesh layers. As a means for reenforcing that portionof the high temperature insulating material adjacentthe surface exposed tothe heat or inside face df the door or cover, there vare secured atspaced intervals to the wire mesh :structure l; a plurality ofwires or rods l5 which are preferably twisted or distorted, which rods extend through about three-fourths of the thickness of the insulated part of the door or cover between the reenforcing mesh l and the surface exposed to the heat or' inside face of the door or cover.

The body of the door or cover, according to the present invention, is a high temperature resisting insulating material I4, which comprises approximately 48 per cent. by Weight of'a high temperature resistant insulating material which is crushed into irregular fragments from one-half to three-fourths of an inch in diameter, 24 per 40 cent. by weight of a similar material with said material being crushed to the extent that it will pass through a one-eighth inch square mesh, 24 percent. by Weight of a` high temperature cement, and a sufficient quantity of water to thoroughly mix said materials together into a plastic state. The plastic mortar is then carefully worked into the door or cover so that all spaces between the reenforcing mesh are properly filled and so that all of the reenforcing wires and rods are in proper 50V position as the door or cover is being filled to the proper thickness. The amounts and nature of the material used to make up the high temperature resistant insulated lining may be changed to suit the conditions of service required. After the door or cover has been built up to the required thickness, it is permitted to set until thoroughly dried before being put into use., When installed, the door must be slowly heated, so as to evaporate all moisture remaining therein, after which, the door will withstand the high temperatures without danger of cracking or spalling.

While we have shown and described a specific embodiment of the present invention, it will be seen that we do not wish to be limited exactly thereto, since various modifications may be made without departing` from the scope of the invention, as defined by the following claims.

l. A furnace door comprising a framework, at

least two layers of wire mesh arranged withinV said framework substantially parallel to each other and to said framework and extending over side of said framework, said layers of wire mesh being attached to the framework and spaced apart from each other and being all embedded in the refractory lining material for reenforcing the same.

2. A furnace door comprising a framework, at least two layers ofwire mesh arranged within and attached to` said framework substantially parallel to each other and to said framework, and a high temperature resisting refractory lining arranged on Ythe'inner side of said framework, means for spacing said layers of wire mesh from each other, a plurality of twisted wires carried by the inner layer of wire mesh and extending toward the inner side of said door, said layers of wire mesh, spacing means and inwardly extendingtwisted wires being all em'- bedded in the refractory lining material for reenforcing the same.

. 3. A furnace door comprisingwa framework, two layers of wire mesh arranged within said framework substantially parallel to each other and to said framework, and a high temperature resisting refractory lining arranged on the inner side of said framework, one of said layers of wire mesh being positioned substantially cenvtwo layers of wire mesh arranged Vwithin and attached to said framework substantially parallel to each other and to said framework, and a high temperature resisting refractory lining arranged on the inner side of said framework, one of said layers of wire mesh being positioned at a distance from the outer face of said framework equal to about one-fourth the thickness of the door with the other of said layers of wire mesh Y bein'gpositioned at a distance from thev outer face of said frame equal to about one-half the thickness of the door, both of said layers of wire mesh being embedded in said -refractory lining material so as to reenforce the same.'

5. In combination with a door to cover framework, two layers of wire mesh arranged within said framework substantially parallel to each other and to said framework and connected thereto, a high temperature resisting refractory lining arranged on the inner side of lsaid framework, one of said layers of wire mesh being positioned at a distance from the outer face of said frame equal to about one-fourth the thickness of the door with the other of said layers of wire mesh being positioned at a`distance from the outer face of said frame equal to about one-half the thickness of the door so as to be positioned substantially in the center thereof, a plurality of wire members extendingbetween said layers of wire mesh for spacing the same from each other,

and a plurality of twisted wires carried by the said centrally positioned layer of wire mesh and extending toward the inner side of said door, said layers of wire mesh, spacing wires, and inwardly extending twisted wires reenforcing 'the refractory lining material in which they are embedded.

LEWIS J. HOLLMAN. WILLIAM F. N oEL.l 

